128630646 has 32 divisors (see below), whose sum is σ = 300892800. Its totient is φ = 40619880.

The previous prime is 128630597. The next prime is 128630647. The reversal of 128630646 is 646036821.

128630646 is a `hidden beast` number, since 1 + 2 + 8 + 6 + 3 + 0 + 646 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128630646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128630647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61660 + ... + 63711.

It is an arithmetic number, because the mean of its divisors is an integer number (9402900).

Almost surely, 2^128630646 is an apocalyptic number.

128630646 is an abundant number, since it is smaller than the sum of its proper divisors (172262154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128630646 is a wasteful number, since it uses less digits than its factorization.

128630646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125401 (or 125395 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 128630646 is about 11341.5451328291. The cubic root of 128630646 is about 504.7947353871.

The spelling of 128630646 in words is "one hundred twenty-eight million, six hundred thirty thousand, six hundred forty-six".